(57) This device, eclosed in a box-like body (1) associable with conventional switches
(2) of the movable-contact type, comprises at least one pin (5) protruding from the
container body and subject to translatory motion upon the onset of differential current
in the electric system, said pin (5) being accommodated, after the coupling of the
device to a switch, within a port (11) provided in the coupling wall of said switch.
In the coupled position the pin is arranged substantially in contact with the contact
release lever (6) of the switch. The movable pin is guided, in its releasing and resetting
strokes along first cam guides (13) provided in the walls of the container body, while
second cam guides (16) are provided having such a path as to allow the pin (5) to
pass below the release lever (6) and then assume its correct resetting position, thus
allowing the coupling operation without errors in positioning the pin (5) with respect
to the release lever (6).
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